ISLAMABAD (Agencies) - Presidential spokesman Farhatullah Babar while rejecting statement of Indian External Affairs Minister Pranab Mukherjee in which he denied making any phone call to President Asif Ali Zardari, declared it as ridiculous. Talking to a private TV channel on Sunday, he said "It is so regrettable that India instead of investigating the matter is again levelling baseless allegations against Pakistan." Reacting to the statement of the Indian minister, he maintained President Zardari was telephoned from the Indian Foreign Ministry's authentic number and evidences in this respect have been imparted to India. He went on to say that officials of Indian Foreign Ministry have also admitted that Mukherjee made phone call to President Zardari. Now it is responsibility of the Indian Foreign Minister to investigate who was behind making phone call to the President, he added. He categorically stated that India is trying to increase tension and not sincere to resolve problems. Call cannot be transferred to the President without verification, he said. He said that the government has already clarified its position and he would not like to say any thing more in this regard. "It is the responsibility of India to investigate if anyone misuses the Indian Foreign Ministry," he concluded. Earlier, India's Foreign Minister said on Sunday that Pakistani reports about a hoax call made in his name during the Mumbai siege were an attempt to divert blame for the attacks. The call, from someone claiming to be Pranab Mukherjee to President Asif Ali Zardari, put Pakistan on high alert of a military strike by India while militants were still fighting security forces in Mumbai. "I had made no such telephone call," Mukherjee said in a statement explaining how India rushed to clarify that the call was a hoax. "I can only ascribe this series of events to those in Pakistan who wish to divert attention from the fact that a terrorist group operating from Pakistani territory planned and launched a ghastly attack on Mumbai." Pakistan responded to the hoax call by putting its air force on stand-by, and the incident triggered a flurry of diplomatic activity as world leaders feared a row between the nuclear-armed rivals could lead to war. Mukherjee said it was 'worrying' that Pakistan could 'even consider acting on the basis of such a hoax call'. The US sent Secretary of State Condoleezza Rice to India and Pakistan last week to keep a lid on tensions between the neighbours, who have fought three wars since independence from Britain in 1947. Pakistan has repeatedly called for 'concrete proof' from India, which says the only gunman captured alive has admitted that all the attackers had come from across the border.